Since it's based on the concept of the seventh son, the main character is probably that seventh son himself. However, there could be other important characters like an antagonist who tries to stop the seventh son from fulfilling his destiny, or a female lead who teams up with the seventh son on his adventures. There might also be an old wise man or woman in the village who gives the seventh son advice based on their knowledge of the old legends related to the seventh son.
I'm not sure as I haven't read it, but it's likely that the seventh son is one of the main characters. There might also be his parents, siblings or some kind of mentor figure who helps him understand his role as the seventh son.
Since I don't know the exact Seventh Light Novel, in general, there could be a hero or heroine with some special abilities or qualities. There may be a sidekick who provides comic relief or helps the main character in tough situations. And there could be an antagonist who creates obstacles for the main character's goals.
The 'Seventh Son Based on Novel' could be a story that revolves around the seventh son in a family. In some traditional tales, the seventh son was thought to have extraordinary abilities, like being more in tune with the supernatural. Maybe in this novel - based story, he has to face some sort of challenges, either related to his family's secrets, or some external threats that are somehow connected to his status as the seventh son.
I don't know who the author of the 'Seventh Son Novel' is. You could try looking it up in a library database or on a book - selling website.
Then there is an old mentor - like character. He has vast knowledge and experience, and he plays a crucial role in guiding the Seventh Godking in his journey, especially in understanding the power he possesses and how to use it effectively.
In a general 'Seventh Man Story', the main characters would likely include the titular seventh man. There could be a leader in the group he is part of, who might initially underestimate or misunderstand him. There may also be a sidekick or a confidant to the seventh man, someone he trusts and shares his secrets with. Additionally, there could be an antagonist, someone who is against the seventh man or the group as a whole, trying to disrupt their plans or harm them.
In the 'the seventh day story', the main characters might be a group of friends who have a pact that every seventh day they do something together. Or it could be a single protagonist who is on a quest and the seventh day is crucial in that quest. For example, if it's a fantasy story, the hero might face a big challenge on the seventh day.
Since it's based on a true story, the main characters could be individuals who had a significant impact on the real - life events that the series is based on. It might be a family member, like a father or a son if the title is any indication. Or it could be people related to a particular incident, such as a group of friends involved in a remarkable adventure or a group of workers in a crucial project.
Since we don't have the full details of the story, it's hard to say exactly who the main characters are. But we can assume that the seventh man is a main character. There may also be others who are related to him in some way, like his friends or foes.
The most prominent character is clearly the seventh man. He is the one through whose eyes we see the events unfold. And of course, there's his friend who unfortunately died in the wave. Without his friend, the whole story of the seventh man's trauma and his journey to overcome it wouldn't exist.
The main character is the seventh man. His friend K was also an important character. The seventh man is the one who tells the story and has been deeply affected by the events involving K and the wave.